A136172 - OEIS

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A136172 as a simple table

n	a(n)
0	1
1	2
2	9
3	105
4	2702
5	154609
6	19092682
7	5161046609
8	3089394167519
9	4175309542037953
10	12956948188014836324
11	93772653247517510010693
12	1603175184493001749597050954
13	65450800470044797091307950768285

[1,2,9,105,2702,154609,19092682,5161046609, 3089394167519,4175309542037953, 12956948188014836324,93772653247517510010693, 1603175184493001749597050954, 65450800470044797091307950768285]